Layers: corner, location - Procházka Lukáš Ing.

From: "Procházka Lukáš Ing. - Pontex s. r. o." <LPr@pontex.cz>
To: ConTeXt <ntg-context@ntg.nl>
Subject: Layers: corner, location
Date: Fri, 07 Jun 2013 09:07:17 +0200	[thread overview]
Message-ID: <op.wyarefs8tpjj8f@lpr> (raw)

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Hello,

I'm trying to understand meaning of "location" and "corner" keywords of layer definition (http://wiki.contextgarden.net/Layers#My_first_Layer).

The goal is to place a logo (here: a \framed) to the top right corner of the page, with vertical and horizontal shift 5 mm into the centre of the page.

The working code is:

----
\definelayer
   [Logo]
   [location={left,bottom},
    x=\paperwidth,
    y=0mm,
    hoffset=-5mm,
    voffset=5mm,
   ]

\setlayer
   [Logo]
   {\framed[width=4cm,height=1cm]{LOGO}}

\setupbackgrounds[page][background=Logo]

\starttext
   \input knuth
\stoptext
----

Although it works, it's a result of many attempts.
I don't understand why "location={left,bottom}" is the correct choice although the referential point of the logo is *right-top* corner and I'm placing the logo into the *right-top* corner of the layer (page).

I played with "corner=" and "location=" combinations but - it seems the only one which gives the good result is the one above.

Could anyone explain this?

Thanks in advance.

Best regards,

Lukas

-- 
Ing. Lukáš Procházka [mailto:LPr@pontex.cz]
Pontex s. r. o.      [mailto:pontex@pontex.cz] [http://www.pontex.cz]
Bezová 1658
147 14 Praha 4

Tel: +420 244 062 238
Fax: +420 244 461 038

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\definelayer
  [Logo]
  [location={left,bottom},
   x=\paperwidth,
   y=0mm,
   hoffset=-5mm,
   voffset=5mm,
  ]

\setlayer
  [Logo]
  {\framed[width=4cm,height=1cm]{LOGO}}

\setupbackgrounds[page][background=Logo]

\starttext
  \input knuth
\stoptext

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